Comment #43 on issue 1778 by smichr: Rational from string can be improved http://code.google.com/p/sympy/issues/detail?id=1778
Regarding (1) above: being able to do the whole expression at once doesn't come until commit 1975, but the functionality to convert the reals to rationals is present in this commit:
nsimplify(.1, rational=1)
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